Creatine is a natural compound that works as a fast energy backup for muscle and brain cells. In older adults doing strength training, creatine added more muscle and strength than training alone across 22 trials. For the brain, small studies suggest it may improve short-term memory and reasoning, especially under stress such as sleep deprivation, and it seems to help vegetarians most. It's cheap and among the best-studied supplements for safety, but the brain evidence is still early.
- SymptomWeaker muscles and slower thinking with age
- Before thatMuscle and brain cells run short of quick energy under load
- Before thatThe fast backup energy system is underused or low
- RootLess creatine in the tissues, plus less training stimulus
What creatine actually does
Your cells run on ATP, a tiny rechargeable energy molecule. During a sudden burst of effort, like lifting something heavy or a burst of intense thinking, ATP gets used up faster than the power plants in your cells can recharge it. Creatine is the backup: stored as phosphocreatine, it recharges ATP almost instantly.
Think of it as a power bank for your phone. The main charger (your mitochondria) works steadily, but when demand spikes, the power bank keeps you going. Your body makes some creatine and you get more from meat and fish, which is why vegetarians usually have lower levels.
Muscle: the strongest evidence
A meta-analysis, a study combining many studies, pooled 22 randomized trials (where people were assigned by chance to creatine or not) in adults aged roughly 57 to 70. People who took creatine while doing strength training gained about 1.4 kg more lean muscle and more upper- and lower-body strength than those on a placebo, a dummy pill.[1]
That matters because losing muscle with age, called sarcopenia, drives frailty, falls and lower energy. Creatine isn't a replacement for training; it's an amplifier. Without the training, the effect is small.
The brain: early but intriguing
Your brain is an energy hog, and it uses creatine too. A review of six trials in healthy people found creatine may improve short-term memory and reasoning; results for other mental skills were mixed. Interestingly, vegetarians, who start with lower levels, responded better on memory tasks.[2]
The most striking recent study tested a single high dose during a night without sleep. Compared with a placebo, creatine improved memory and processing speed and partly reversed the drop in brain energy markers caused by sleep loss.[3] But it used a very high one-off dose (about 0.35 g per kilogram of body weight) in only 15 people, so it's a proof of concept, not a daily recommendation.
Creatine is a bodybuilding supplement for young men.
Some of its best evidence is in adults over 50, for keeping muscle and strength, and early studies suggest benefits for the brain too.
How people use it
Not medical advice. Check with your doctor first, especially if you have kidney disease or take medication.
- Form: creatine monohydrate, ideally with a third-party testing seal.
- Dose: about 3 to 5 grams a day, at any time of day.
- Pair it with strength training two or three times a week. That's where the muscle benefit comes from.
- Expect a small weight gain of about 1 kg at first, mostly water stored in muscle.
The bottom line
Creatine is one of the few supplements with strong human evidence relevant to aging: more muscle and strength when combined with training. The brain evidence is earlier but promising, especially for vegetarians and under stress. It's inexpensive and well studied for safety. For where it fits among other supplements, see the best supplements for longevity, graded.
Frequently asked questions
How much creatine should I take?
Most studies use about 3 to 5 grams of creatine monohydrate a day. A higher "loading" phase isn't necessary; a steady daily dose fills your stores within about a month.
Is creatine safe for the kidneys?
In healthy people, research hasn't shown kidney harm at normal doses. Creatine can raise creatinine, a blood marker doctors use to check kidneys, which can look alarming on a lab test without real damage. Tell your doctor you take it, and avoid it if you have kidney disease unless your doctor approves.
Which type of creatine is best?
Creatine monohydrate is the most studied, cheapest and effective form. Fancier versions haven't been shown to work better.
Does creatine help women and older adults?
Yes. The muscle benefits in older adults were seen in both men and women, and creatine is not just for young athletes.
Sources
- Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access Journal of Sports Medicine, 2017.
- Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D. Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Experimental Gerontology, 2018.
- Gordji-Nejad A, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation. Scientific Reports, 2024.